Open Lenny-Hu opened 5 years ago
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// ++在变量前,变量自身先++,然后跟其他变量运算 let a = 1; b = 2; c = 0; c = ++a + b // c = 4, a = 2, b = 2 // ++在变量后,变量先跟其他变量运算,然后变量自身再++ let a = 1; b = 2; c = 0; c = a++ + b // c = 3, a = 2, b = 2
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// b += a 相当于 b = b + a let a = 1; b = 1; b += a; // a = 1, b = 2 // b =+ a 相当于 b = a,基本上这么写无用,还可能有bug??? let a = 2; b = 0; b =+ a; // a = 2, b = 2
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操作符: ++在前先已后人,++在后,先人后已